JP2009089168A - Digital broadcast display system and digital broadcast display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast display system and a digital broadcast display device which can control an interruption of an output of content upon viewing a digital broadcast. <P>SOLUTION: A digital broadcast display system 1 has a tuner module 10 and a personal computer 20. The personal computer 20 has a signal processor 27 performing signal processing to a broadcast signal outputted from the tuner module 10, a display 28 displaying a display area of a video based on the broadcast signal to which the signal processing is performed by the signal processor 27, and a display area detecting portion 36 detecting the size of the display area. Furthermore, the personal computer 20 has a signal selecting portion 22 selecting a high-vision broadcast signal or a one-segment broadcast signal as a broadcast signal to which the signal processing is performed by the signal processor 27, and a CPU 30 making the signal selecting portion 22 select the broadcast signal based on the size of the display area detected by the display area detecting portion 36. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a digital broadcast display system and a digital broadcast display device that perform predetermined signal processing on a received digital broadcast signal and display an image based on the broadcast signal subjected to signal processing.

  In recent years, personal computers (hereinafter referred to as “PCs”) are equipped with advanced AV (Audio Visual) functions, and by connecting a tuner module, which is a device for receiving TV broadcasts, to a personal computer, It is common to view a video on top. Also, TV broadcasting has shifted from analog broadcasting to digital broadcasting, and products for digital broadcasting are also known as tuner modules that are connected to personal computers.

  In addition, as a method of digital broadcasting using Japanese terrestrial waves (hereinafter referred to as “terrestrial digital broadcasting”), a band per channel is divided into 13 segments (a transmission unit having an approximately 430 kHz band). However, a system is employed in which a broadcast signal in which a video signal, an audio signal, and the like are multiplexed is transmitted in a state in which some of these segments are bundled.

  In addition, broadcast signals included in broadcast radio waves used in terrestrial digital broadcasting include HDTV (High Definition Television) (High Definition) or SDTV (Standard Definition Television) (Standard) as digital broadcast signals. Broadcast signal is included. Furthermore, the broadcast signal included in the broadcast radio wave used in terrestrial digital broadcasting is a simple video system (one-segment system) as a digital system broadcast signal with a narrower bandwidth than the high-definition and standard broadcast signals. Broadcast signal is included.

  Among these, the high-definition method is a method of transmitting broadcast signals using 12 segments (12 segments) among the 13 segments (13 segments) described above, and the standard method is a method of transmitting 13 broadcast segments. In this method, broadcast signals are transmitted using four segments (four segments). The one-segment system is a system that transmits a broadcast signal using one segment (one segment) among the 13 segments described above. As described above, the high-definition system can transmit high-definition video and the like because the bandwidth of the broadcast signal to be used is wider than the standard system and the one-segment system. On the other hand, the one-seg system can transmit only low-quality video compared to the video transmitted by the high-definition and standard methods because the bandwidth of the broadcast signal used is narrow compared to the high-definition and standard methods. Compared to the standard system, it is suitable for mobile receiving terminals such as mobile phones.

As a digital broadcast display device for displaying such terrestrial digital broadcast video, a digital broadcast display device comprising a tuner module for receiving terrestrial digital broadcast and a personal computer connected to the tuner module is disclosed. ing. This digital broadcast receiving apparatus receives broadcast radio waves transmitted from a broadcast station, and performs predetermined signal processing on digital broadcast signals (hereinafter referred to as “digital broadcast signals”) included in the broadcast radio waves. The content based on the digital broadcast signal is output. More specifically, in the tuner module, first, a digital broadcast signal corresponding to a desired channel is selected from a digital broadcast signal included in a broadcast wave of a terrestrial digital broadcast received via a dedicated antenna. Select by the tuning section). Next, the selected digital broadcast signal is demodulated and the like, and if the digital broadcast signal is scrambled, the scramble is released and the transport stream format (hereinafter referred to as the MPEG-2 system) is applied. , “TS format”) is obtained. Next, the digital broadcast signal in the TS format is encrypted, and the encrypted digital broadcast signal is transmitted to the personal computer via a general-purpose interface. Next, the personal computer decrypts the encrypted digital broadcast signal, separates the video signal and the audio signal from the digital broadcast signal, and decodes the data (video data and audio data) contained in the signal. Perform processing. And while displaying the image | video based on a video signal on a display (display part), it becomes the structure which reproduces | regenerates the audio | voice based on an audio | voice signal with a speaker (for example, refer patent document 1).
JP 2006-74666 A

  Here, when viewing a terrestrial digital broadcast, signal processing for decrypting an encrypted digital broadcast signal, or data included in the digital broadcast signal and compressed based on the MPEG-2 system Therefore, it is necessary to perform signal processing for performing decoding processing and the like, and when the processing capability of the personal computer is insufficient, these processing are delayed. In other words, the processing capacity of a personal computer is limited, and when multiple programs are executed simultaneously on a personal computer, the resources (resources) allocated to the above signal processing necessary for viewing digital terrestrial broadcasting are insufficient. Thus, signal processing cannot be performed at an appropriate timing. As a result, there is a problem that the output (display and playback) of content such as video and audio on a display or a speaker is interrupted.

  Accordingly, the present invention has been made in view of the above-described problems, and a digital broadcast display system and a digital broadcast display that can suppress output of content based on a broadcast signal from being interrupted when viewing digital broadcast. An object is to provide an apparatus.

  According to the first aspect of the present invention, a digital broadcast receiving apparatus that receives broadcast radio waves and outputs a digital broadcast signal included in the broadcast radio waves, and a digital broadcast receiver that is connected to the digital broadcast receiver and output from the digital broadcast receiver. A digital broadcast display system including a digital broadcast display device that performs predetermined signal processing on the broadcast signal and displays a video based on the broadcast signal subjected to the signal processing. A signal processing unit that performs signal processing on a broadcast signal output from the digital broadcast receiving device, a display unit that displays video based on the broadcast signal subjected to signal processing by the signal processing unit in a predetermined display area, and a display A first broadcast signal having a first bandwidth as a broadcast signal that is subjected to signal processing by a display region detection unit that detects the size of the region and a signal processing unit And a signal selection unit that selects one of the second broadcast signals having a second bandwidth that is narrower than the first bandwidth, and a signal based on the size of the display area detected by the display region detection unit And a control unit that causes the selection unit to select one of the first and second broadcast signals.

  According to this configuration, one of the first and second broadcast signals is selected as a broadcast signal to be subjected to signal processing by the signal processing unit based on the size of the display area. For this reason, for example, when the size of the display area is small, the signal processing is performed such that the second broadcast signal having the second bandwidth narrower than the first bandwidth is subjected to signal processing. The burden can be reduced. As a result, it is possible to suppress interruption of content output (for example, display and playback of video and audio) based on broadcast signals when viewing digital broadcasts.

  A second aspect of the present invention is the digital broadcast display system according to the first aspect, wherein the control unit is a video whose size of the display area detected by the display area detection unit is based on the second broadcast signal. If the size of the display area is larger than the size of the video based on the second broadcast signal, the signal selection unit selects the first broadcast signal. If it is determined that the size of the display area is smaller than the size of the video based on the second broadcast signal, or the size of the display area is equal to the size of the video based on the second broadcast signal, the signal selection unit The second broadcast signal is selected.

  According to the configuration, when it is determined that the size of the display area is larger than the size of the video based on the second broadcast signal, the first broadcast signal is used as the broadcast signal subjected to signal processing by the signal processing unit. Select. When it is determined that the size of the display area is smaller than the size of the video based on the second broadcast signal, or the size of the display area is equal to the size of the video based on the second broadcast signal, the signal processing unit The second broadcast signal is selected as the broadcast signal to be subjected to signal processing. Therefore, when the size of the display area is larger than the size of the video based on the second broadcast signal, for example, the content based on the first broadcast signal having a first bandwidth wider than the second bandwidth. Can be used to view digital broadcasts with high-quality images. Further, when the size of the display area is smaller than the size of the video based on the second broadcast signal, or the size of the display area is equal to the size of the video based on the second broadcast signal, for example, the first band By outputting the content based on the second broadcast signal having the second bandwidth narrower than the width, it is possible to view the digital broadcast while suppressing the output of the content from being interrupted.

  A third aspect of the present invention is the digital broadcast display system according to the first or second aspect, wherein the display area detecting unit detects whether or not the size of the display area has been changed, and the control unit When the change in the size of the display area is detected, the signal selection unit selects one of the first and second broadcast signals based on the size of the display area detected by the display region detection unit. One of them is selected.

  According to this configuration, when it is detected that the size of the display area has been changed, one of the first and second broadcast signals is selected as the broadcast signal to be subjected to signal processing by the signal processing unit. It is configured to do. Therefore, for example, even when the size of the display area is changed while a digital broadcast is being viewed, it is possible to prevent content output based on the broadcast signal from being interrupted.

  According to a fourth aspect of the present invention, there is provided a digital broadcast receiver that receives a broadcast radio wave and outputs a digital broadcast signal included in the broadcast radio wave, and a predetermined broadcast signal output from the digital broadcast receiver. A signal processing unit that performs signal processing, a display unit that displays a video based on the broadcast signal that has been subjected to signal processing by the signal processing unit, in a predetermined display region, a display region detection unit that detects the size of the display region, One of the first broadcast signal having the first bandwidth and the second broadcast signal having the second bandwidth narrower than the first bandwidth as the broadcast signal subjected to signal processing by the signal processing unit. And a control unit that causes the signal selection unit to select one of the first and second broadcast signals based on the size of the display region detected by the display region detection unit. Features .

  According to this configuration, one of the first and second broadcast signals is selected as a broadcast signal to be subjected to signal processing by the signal processing unit based on the size of the display area. For this reason, for example, when the size of the display area is small, the signal processing is performed such that the second broadcast signal having the second bandwidth narrower than the first bandwidth is subjected to signal processing. The burden can be reduced. As a result, it is possible to suppress interruption of content output (for example, display and playback of video and audio) based on broadcast signals when viewing digital broadcasts.

  According to a fifth aspect of the present invention, in the digital broadcast display device according to the fourth aspect, the control unit is an image in which the size of the display area detected by the display area detection unit is based on the second broadcast signal. If the size of the display area is larger than the size of the video based on the second broadcast signal, the signal selection unit selects the first broadcast signal. If it is determined that the size of the display area is smaller than the size of the video based on the second broadcast signal, or the size of the display area is equal to the size of the video based on the second broadcast signal, the signal selection unit The second broadcast signal is selected.

  According to the configuration, when it is determined that the size of the display area is larger than the size of the video based on the second broadcast signal, the first broadcast signal is used as the broadcast signal subjected to signal processing by the signal processing unit. Select. When it is determined that the size of the display area is smaller than the size of the video based on the second broadcast signal, or the size of the display area is equal to the size of the video based on the second broadcast signal, the signal processing unit The second broadcast signal is selected as the broadcast signal to be subjected to signal processing. Therefore, when the size of the display area is larger than the size of the video based on the second broadcast signal, for example, the content based on the first broadcast signal having a first bandwidth wider than the second bandwidth. Can be used to view digital broadcasts with high-quality images. Further, when the size of the display area is smaller than the size of the video based on the second broadcast signal, or the size of the display area is equal to the size of the video based on the second broadcast signal, for example, the first band By outputting the content based on the second broadcast signal having the second bandwidth narrower than the width, it is possible to view the digital broadcast while suppressing the output of the content from being interrupted.

  A sixth aspect of the present invention is the digital broadcast display device according to the fourth or fifth aspect, wherein the display area detecting unit detects whether or not the size of the display area has been changed, and the control unit When the change in the size of the display area is detected, the signal selection unit selects one of the first and second broadcast signals based on the size of the display area detected by the display region detection unit. One of them is selected.

  According to this configuration, when it is detected that the size of the display area has been changed, one of the first and second broadcast signals is selected as the broadcast signal to be subjected to signal processing by the signal processing unit. It is configured to do. Therefore, for example, even when the size of the display area is changed while a digital broadcast is being viewed, it is possible to prevent content output based on the broadcast signal from being interrupted.

  ADVANTAGE OF THE INVENTION According to this invention, when viewing digital broadcasting, it can suppress that the output of the content based on a broadcast signal interrupts.

Embodiments according to the present invention will be described below with reference to FIGS.
As shown in FIG. 1, a digital broadcast display system 1 according to this embodiment includes a tuner module 10 that is a digital broadcast receiver that receives broadcast waves of digital broadcasts, and a digital that is an electronic device to which the tuner module 10 is connected. It is comprised by the personal computer 20 as a broadcast display apparatus.

  The tuner module 10 includes an antenna 11 that receives broadcast radio waves, and a broadcast corresponding to a desired channel among digital broadcast signals (hereinafter simply referred to as “broadcast signals” or “signals”) included in the broadcast radio waves. A tuner unit 12 that selects a signal and a demodulation unit 13 that demodulates a broadcast signal selected by the tuner unit 12 are provided. Further, the tuner module 10 includes a descrambling processing unit 14 for descrambling the demodulated broadcast signal, an IC card interface 15 to which the IC card 4 is connected, and encryption for encrypting the descrambled broadcast signal. A processing unit 16 and an interface 17 for transmitting the encrypted signal to the personal computer 20 are provided.

  The personal computer 20 is selected by an interface controller 21 to which an encrypted signal is input, a signal selection unit 22 that selects either a high-definition broadcast signal or a one-segment broadcast signal, and the signal selection unit 22. A decryption processing unit 23 that decrypts the encrypted signal and a demultiplexing unit 24 that separates the decrypted signal are provided. Further, the personal computer 20 displays video based on the video data processing unit 25 and the audio data processing unit 26 that perform decoding processing and the like on the data included in the separated broadcast signal, and the video data subjected to the decoding processing. Display 28 and a speaker 29 that reproduces sound (sounds sound) based on the decoded sound data. The above-described decoding processing unit 23, demultiplexing unit 24, video data processing unit 25, and audio data processing unit 26 constitute a signal processing unit 27 that performs predetermined signal processing on the broadcast signal output from the tuner module 10. Has been. The display 28 and the speaker 29 constitute a content output unit that outputs (displays and reproduces) content (video and audio) included in the broadcast signal.

  In addition, the display 28 which is a display part has the rectangular-shaped screen 28a for displaying an image | video, as shown in FIG. The entire screen 28a is composed of a plurality of pixels (not shown) arranged in a matrix.

  The personal computer 20 includes a CPU 30 as a control unit, an installation unit 31 for installing a control program, an HDD 32 as a storage unit for storing the control program, and a keyboard 33 for a user to perform an input operation. I have. The CPU 30 uses the control signal to control the personal computer 20 based on the control program for viewing the digital broadcast using the tuner module 10 and the input operation of the user (that is, the viewer of the digital broadcast) using the keyboard 33. The respective parts 21 to 26 are controlled.

  The installation unit 31 includes a CD / DVD drive device 31a and a LAN controller 31b. When installing the control program using the CD / DVD drive device 31a, the control program stored in the CD or DVD attached to the tuner module 10 is stored in the HDD 32 via the CD / DVD drive device 31a. To be installed. On the other hand, when the control program is installed using the LAN controller 31b, the control program obtained via the communication connector 34 connected to the network line by a communication cable (not shown) is transferred to the HDD 32 via the LAN controller 31b. It is installed by being stored in.

  The personal computer 20 also has a display control unit that controls a display area in which video based on a broadcast signal subjected to signal processing by the signal processing unit 27 is displayed on the display 28 that displays video based on a control signal of the CPU 30. 35 and a display area detector 36 for detecting a display area in which an image is displayed. The display control unit 35 gives a rectangular display area R (that is, a window) for displaying an image based on the broadcast signal to the application software including the above-described control program. Control to display video based. That is, the video based on the broadcast signal is not displayed on the entire screen 28a of the display 28, but the video based on the broadcast signal is displayed on the display region R (see FIG. 2) which is a part of the screen 28a of the display 28. The The size and position of the display area R on the display 28 can be changed based on the user's input operation. In this embodiment, as shown by the white arrow in FIG. It is assumed that the size of the display region R is changed while the ratio of the size of the display region R in the vertical direction Y is maintained at 4: 3. The display control unit 35 is connected to the CPU 30 that is a control unit, and controls display of the display area R and the video displayed in the display area R based on a control signal from the CPU 30.

  The display area detection unit 36 detects the size (that is, the window size) of the display area R on which video based on the broadcast signal is displayed on the display 28 based on the display area control performed by the display control unit 35. Further, by repeatedly detecting the size of the display region R, it is detected whether or not the size of the display region R has been changed. These detection results are output to the CPU 30. Note that “the size of the display region R” refers to “the number of pixels constituting the display region R”.

Next, the operation of the tuner module 10 will be described.
First, the antenna 11 receives a broadcast wave transmitted from a broadcast station, and outputs a digital broadcast signal included in the received broadcast wave to the tuner unit 12. Note that video signals, audio signals, and the like in digital broadcasting are multiplexed according to the MPEG-2 Systems standard, and the digital broadcasting signal is a TS format signal. The digital broadcast signal corresponding to one channel includes a first broadcast signal and a second broadcast signal. The first broadcast signal has a first bandwidth, and the second broadcast signal has a second bandwidth that is narrower than the first bandwidth.

  More specifically, a digital broadcast signal corresponding to one channel has a predetermined bandwidth (about 5.6 MHz), and this bandwidth is divided into 13 segments. The digital broadcast signal used by one broadcast station includes a first broadcast signal that is a broadcast signal using 12 segments of the 13 segments described above and a broadcast signal that uses one segment of the 13 segments described above. And a second broadcast signal. The first broadcast signal (hereinafter referred to as “high-definition broadcast signal”) includes a video signal including video data compressed and encoded by the MPEG-2 Video system, and a second broadcast signal (hereinafter referred to as “broadcast signal”). “One-segment broadcasting signal”) has a video signal including video data compressed and encoded by the MPEG-4 AVC method (H.264 method). Also, the high-definition broadcast signal and the one-segment broadcast signal have an audio signal including audio data compressed and encoded by the MPEG-2 AAC method.

  The tuner unit 12 selects a digital broadcast signal (in this case, both a high-definition broadcast signal and a one-segment broadcast signal) corresponding to a channel designated by the user from the digital broadcast signal input from the antenna 11, Output to demodulator 13. That is, the tuner unit 12 extracts a digital broadcast signal having a specific frequency from digital broadcast signals including video data and audio data, and outputs the digital broadcast signal to the demodulation unit 13.

  The demodulator 13 demodulates the digital broadcast signal selected by the tuner unit 12 and performs signal processing for performing transmission path decoding on the broadcast signal in order to correct a code error occurring in the transmission path. The digital broadcast signal subjected to transmission path decoding is output to the descramble processing unit 14.

  The descramble processing unit 14 uses the descramble key (release key) obtained from the IC card 4 connected to the IC card interface 15 to release the scramble when the digital broadcast signal is scrambled. Process. The scrambled digital broadcast signal is output to the encryption processing unit 16.

  Then, the digital broadcast signal is encrypted by a predetermined method such as DES (Data Encryption Standard) or AES (Advanced Encryption Standard) by the encryption processing unit 16 (that is, signal processing for encrypting the digital broadcast signal is performed). Applied). The encrypted digital broadcast signal is output to the personal computer 20 via the general-purpose interface 17 (for example, USB 2.0). The tuner module 10 includes a CPU 18 as a control unit that controls each of the tuner unit 12, the demodulation unit 13, the descrambling processing unit 14, the IC card interface 15, and the encryption processing unit 16. These units are controlled in accordance with instructions from the CPU 30 of the personal computer 20.

  Next, the operation of the personal computer 20 when receiving a digital broadcast signal via the tuner module 10 and viewing the digital broadcast based on the installed control program will be described.

  The digital broadcast signal encrypted by the tuner module 10 is input to the interface controller 21 and input to the decryption processing unit 23 via the signal selection unit 22. The decryption processing unit 23 decrypts the digital broadcast signal encrypted in a predetermined format such as DES and AES (that is, performs signal processing for decrypting the digital broadcast signal), and decrypts the TS format. The digital broadcast signal is output to the demultiplexing unit 24.

  The demultiplexing unit 24 demultiplexes the multiplexed digital broadcast signal, which is a TS format signal, into a video signal including video data, an audio signal including audio data, a transmission control signal including program information, and the like. That is, the demultiplexing unit 24 performs signal processing for separating the multiplexed digital broadcast signal. Then, the video signal and the audio signal, which are broadcast signals separated by the demultiplexing unit 24, are output to the video data processing unit 25 and the audio data processing unit 26, respectively.

  The video data processing unit 25 performs signal processing on a video signal which is a broadcast signal, thereby compressing and encoding the video signal based on the MPEG-2 Video system or the MPEG-4 AVC system (H.264 system). The compressed video data is expanded by decoding the video data that has been compressed. Then, the video data including the developed video data is output to the display control unit 35 by the video data processing unit 25. That is, a video signal that is a broadcast signal subjected to signal processing by the signal processing unit 27 is output to the display control unit 35. Then, a video based on the broadcast signal subjected to the signal processing by the signal processing unit 27 is displayed in the predetermined display area R of the display 28 by the display control unit 35.

  In addition, the audio data processing unit 26 performs signal processing on the audio signal that is a broadcast signal, thereby decoding audio data that is included in the audio signal and that is compression-encoded based on the MPEG-2 AAC system. Go and expand the compressed audio data. Then, an audio signal including the expanded audio data is output to the speaker 29 by the audio data processing unit 26. That is, an audio signal that is a broadcast signal subjected to signal processing by the signal processing unit 27 is output to the speaker 29. Then, sound based on the broadcast signal subjected to signal processing is reproduced by the speaker 29.

  In this way, the signal processing unit 27 (the decoding processing unit 23, the demultiplexing unit 24, the video data processing unit 25, and the audio data processing unit 26) performs signal processing on the broadcast signal and performs signal processing. Content (video, audio) based on the broadcast signal (high-definition or one-segment content) is output (displayed and reproduced).

  Here, in the present embodiment, a display area detection unit 36 that detects the size of the display area R, a signal selection unit 22 that selects a broadcast signal subjected to signal processing by the signal processing unit 27, and a display area detection A feature is that a CPU 30 is provided that causes the signal selection unit 22 to select a broadcast signal based on the size of the display region R detected by the unit 36. Hereinafter, a content output procedure in the digital broadcast display system 1 according to the present embodiment will be described in detail with reference to FIGS. 3 to 5.

  First, the user inputs an instruction to output the content of the program desired by the user to the CPU 30 using the keyboard 33 (step S1). When an instruction to output content is input to the CPU 30, application software including the above-described control program is activated, and the tuner module 10 outputs a broadcast signal to the personal computer 20. Next, a broadcast signal selection process based on the size of the display area R is performed to select a high-definition or one-segment broadcast signal (step S2).

  More specifically, the broadcast signal selection process based on the size of the display area R in step S2 is performed according to the procedure shown in FIG. That is, first, the display area detector 36 detects the size of the display area R that the display controller 35 gives to the application software including the above-described control program (step S11). Next, the CPU 30 determines whether or not the size of the display area R detected in step S11 is larger than the size of the video based on the one-segment broadcasting signal (step S12). That is, the size of the video based on the one-segment broadcasting signal is 180 pixels or 240 pixels in the vertical direction Y (vertical direction) and 320 pixels in the horizontal direction X (horizontal direction). Accordingly, for example, the size of the display region R in the horizontal direction X among the sizes of the display region R detected in step S11 and the size in the horizontal direction X of the video based on the one-segment broadcasting signal (that is, 320 pixels). Can be determined in step S12. When the size of the display region R in the horizontal direction X is larger than 320 pixels, the CPU 30 determines that the size of the display region R detected in step S11 is larger than the size of the video based on the one-segment broadcasting signal. to decide. On the other hand, when the size of the display region R in the horizontal direction X is equal to or smaller than 320 pixels, the CPU 30 determines that the size of the display region R detected in step S11 is a one-segment broadcasting signal. Judge that it is not larger than the size of the image based on. That is, it is determined that the size of the display area R is smaller than the size of the video based on the one-segment broadcasting signal, or the size of the display area R is equal to the size of the video based on the one-segment broadcasting signal. “Image size” means “the number of pixels constituting the image”, and “the size of the display area is larger than the image size [small]” means “the display area is It means that the number of constituent pixels is [less] than the number of pixels constituting the video.

  If it is determined in step S12 that the size of the display area R detected in step S11 is not larger than the size of the video based on the one-segment broadcasting signal, the CPU 30 transmits a control signal to The selection unit 22 is made to select a one-segment broadcasting signal (step S13). That is, in step S13, the signal selection unit 22 selects a one-segment broadcasting signal. On the other hand, if it is determined in step S12 that the size of the display area R detected in step S11 is larger than the size of the video based on the one-segment broadcasting signal, the CPU 30 transmits a control signal to select a signal. The unit 22 is made to select a high-definition broadcast signal (step S14). That is, in step S14, the signal selection unit 22 selects a high-definition broadcast signal.

  In addition, as a process which detects the magnitude | size of the display area R in step S11, it can carry out in the procedure shown in FIG. 5, for example. That is, the upper left coordinate of the display area R on the screen 28a is detected (step S21), and then the lower right coordinate of the display area R on the screen 28a is detected (step S22). Finally, the size of the display region R is detected by calculating the size of the display region R in the horizontal direction X and the vertical direction Y (step S23). For example, as shown in FIG. 2, the coordinates of the upper left P1 of the display area R detected in step S21 are (X1, Y1), and the coordinates of the lower right P2 of the display area R detected in step S22 are (X2, Y2). ). In this case, the size of the display area R in the horizontal direction X can be calculated by calculating X2−X1 + 1, and the size of the display area R in the vertical direction Y can be calculated by calculating Y2−Y1 + 1. Can do. Here, the coordinates represented by (X, Y) are an orthogonal coordinate system in which the horizontal direction X is the X axis and the vertical direction Y is the Y axis, and the units of the X coordinate and the Y coordinate constitute the screen 28a. It is a pixel to do.

  As described above, by the selection process of the video signal based on the size of the display area in step S2, the signal selection unit 22 uses the high-definition broadcast signal and the broadcast signal subjected to the signal processing by the signal processing unit 27 as the broadcast signal. Select one of the one-segment broadcasting signals. When the signal selection unit 22 selects one of the high-definition and one-segment broadcasting signals, the signal selection unit 22 continues to output the selected broadcasting signal to the signal processing unit 27 until it is selected again.

  Next, the signal processing unit 27 performs signal processing on the high-definition or one-segment broadcasting signal selected by the signal selection unit 22 in step S2 (step S3). Next, the high-definition or one-segment broadcasting signal (video signal and audio signal) subjected to the signal processing in step S3 is output to the display control unit 35 and the speaker 29 to thereby convert the broadcasting signal subjected to the signal processing. Based on the content (high-definition or one-segment content) is output (step S4). While the signal selection unit 22 continues to output the broadcast signal to the signal processing unit 27, the signal processing unit 27 performs signal processing on the broadcast signal, and content based on the broadcast signal subjected to the signal processing is output. Continue to be.

  Next, after outputting the content based on the broadcast signal subjected to signal processing, the display area detection unit 36 detects whether or not the size of the display area R has been changed (step S5). That is, the display area detection unit 36 performs the process in step S11 described above again, so that whether or not the size of the display area R has been changed during the output of the content (that is, whether or not the window size has been changed). ).

  Next, when it is detected in step S5 that the size of the display area R has been changed, the display area R detected by the display area detector 36 is the same as the process performed in step S2 (steps S11 to S14). Based on the size of the signal, the signal selection unit 22 is made to select either one of the high-definition and one-segment broadcasting signals again (step S6). Next, similarly to the above-described steps S3 and S4, signal processing is performed on the re-selected high-definition or one-segment broadcasting signal, and the content based on the broadcast signal subjected to the signal processing (high-definition or one-segment broadcasting). The system content is output (steps S7 and S8).

  On the other hand, if it is not detected in step S5 that the size of the display region R has been changed, the signal selection unit 22 is already informed based on the size of the display region R detected by the display region detection unit 36. Since one of the high-definition and one-segment broadcasting signals is selected, it is not necessary for the signal selection unit 22 to select the broadcasting signal again. Therefore, if it is not detected in step S5 that the size of the display area R has been changed, step S6 is not performed, and signal processing is performed on the broadcast signal selected again in step S6. Thus, steps S7 and S8 for outputting the content based on the reselected broadcast signal are not required.

  Then, the CPU 30 determines whether or not an instruction to stop the output of content has been input to the CPU 30 by a user input operation using the keyboard 33 (step S9). If it is determined in step S9 that an instruction to stop output of content has been input, the application software including the control program described above is terminated. That is, the tuner module 10 stops outputting the broadcast signal to the signal processing unit 27 by the signal selection unit 22 by stopping outputting the broadcast signal to the personal computer 20. Then, the signal processing by the signal processing unit 27 is stopped, and the output of the content based on the broadcast signal is stopped (step S10).

  On the other hand, if it is determined in step S9 that an instruction to stop the output of content has not been input, the processing from step S5 onward is performed again. That is, the processes in steps S5 to S9 are repeatedly performed until it is determined that an instruction to stop the output of content has been input.

According to the present embodiment described above, the following effects can be obtained.
(1) In the digital broadcast display system 1 according to this embodiment, the personal computer 20 performs signal processing on the broadcast signal output from the tuner module 10, and the signal processing is performed by the signal processing unit 27. And a display 28 for displaying video based on the broadcast signal in the display area R. Furthermore, the personal computer 20 includes a display area detection unit 36 that detects the size of the display area R, and a broadcast signal that is subjected to signal processing by the signal processing unit 27, either a high-definition broadcast signal or a one-segment broadcast signal. A signal selection unit 22 that selects one of them and a CPU 30 that causes the signal selection unit 22 to select a broadcast signal based on the size of the display region R are provided. According to this configuration, based on the size of the display area R, either a high-definition broadcast signal or a one-segment broadcast signal is selected as a broadcast signal subjected to signal processing by the signal processing unit 27. For this reason, when the size of the display region R is small, signal processing is performed so that signal processing is performed on a one-segment broadcasting signal having a second bandwidth that is narrower than the first bandwidth. Has been reduced. As a result, it is possible to suppress interruption of content output (display and playback of video and audio) based on broadcast signals when viewing digital broadcasts.

  (2) The CPU 30 determines that the size of the display region R detected by the display region detection unit 36 is larger than the size of the video based on the one-segment broadcasting signal (for example, 320 pixels which is the size in the horizontal direction X). Judge whether it is large or not. When the CPU 30 determines that the size of the display region R is larger than the size of the video based on the one-segment broadcasting signal, the CPU 30 causes the signal selection unit 22 to select the high-vision broadcasting signal. If the CPU 30 determines that the size of the display area R is not larger than the size of the video based on the one-segment broadcasting signal, the CPU 30 causes the signal selection unit 22 to select the one-segment broadcasting signal. According to the configuration, when it is determined that the size of the display area R is larger than the size of the video based on the one-segment broadcasting signal, the broadcasting signal subjected to signal processing by the signal processing unit 27 is used as a high-definition broadcasting signal. Select a broadcast signal. If it is determined that the size of the display area R is smaller than the size of the video based on the one-segment broadcasting signal, or the size of the display area R is equal to the size of the video based on the one-seg broadcasting signal, As a broadcast signal subjected to signal processing by the processing unit 27, a one-segment broadcast signal is selected. Therefore, when the size of the display area R is larger than the size of the video based on the one-segment broadcasting signal, the content based on the high-definition broadcasting signal having the first bandwidth wider than the second bandwidth is displayed. By outputting, digital broadcasting can be viewed with high-quality images. Further, when the size of the display area R is not larger than the size of the video based on the one-segment broadcasting signal, the content based on the one-segment broadcasting signal having the second bandwidth narrower than the first bandwidth is displayed. By outputting, it is possible to view the digital broadcast while suppressing the output of the content from being interrupted.

  (3) The display area detection unit 36 detects whether or not the size of the display area R has been changed. When the CPU 30 detects that the size of the display area R has been changed, the display area detection unit 36 Based on the size of the display area R detected by 36, the signal selection unit 22 is made to select either the high-definition or one-segment broadcasting signal. According to this configuration, when it is detected that the size of the display area R has been changed, one of the high-definition and one-segment broadcasting signals is used as the broadcasting signal that is subjected to signal processing by the signal processing unit 27. Is selected. Therefore, even when the size of the display region R is changed while the digital broadcast is being viewed, it is possible to suppress the output of content based on the broadcast signal from being interrupted.

In addition, you may change the said embodiment as follows.
In the above embodiment, the digital broadcast display system 1 includes a tuner module 10 as a digital broadcast receiver and a personal computer 20 as an electronic device as a digital broadcast display device used by being connected to the tuner module 10. Although it is configured, as shown in FIG. 6, these may be configured integrally. That is, the tuner module 10 may be integrated with the personal computer 20 that is a digital broadcast display device as a digital broadcast receiver. In this case, the interface 17, the interface controller 21, and the CPU 18 are not necessary, and the configuration of the digital broadcast display device is simplified. In this case, control of the tuner unit 12, the demodulation unit 13, the descrambling processing unit 14, the IC card interface 15, and the encryption processing unit 16 is performed by the CPU 30. Also in this case, the same effects as the above (1) to (3) can be obtained.

  In the above embodiment, the size of the display region R in the horizontal direction X of the size of the display region R is compared with the size of the horizontal direction X of the video based on the one-segment broadcasting signal. You may compare the magnitude | size of the display area R of the vertical direction Y among the magnitude | sizes of R with the magnitude of the magnitude | size of the vertical direction Y of the image | video based on the broadcast signal of a 1 seg system.

  In addition, it is determined whether or not the size of the display area R is larger than the size of the video based on the one-segment broadcasting signal, and the signal selection unit 22 selects the broadcasting signal. It is possible to make the signal selection unit 22 select a broadcast signal by determining whether or not the broadcast signal is larger than. That is, it suffices if the signal selection unit 22 can select either the high-definition or one-segment broadcasting signal based on the size of the display area R.

  In the above embodiment, the first broadcast signal is a high-definition broadcast signal, but the first broadcast signal may be a standard broadcast signal. In this case, the first broadcast signal is a broadcast signal using 4 segments out of the 13 segments described above.

1 is a block diagram showing the overall configuration of a digital broadcast display system according to an embodiment of the present invention. The figure for demonstrating the screen of a display, and the display area which is a part of screen, and the image | video based on a broadcast signal is displayed. The flowchart which shows the procedure of the digital broadcast display method in the digital broadcast display system which concerns on embodiment of this invention. The flowchart which shows the procedure of the selection process of the broadcast signal based on the magnitude | size of a display area. The flowchart which shows the procedure which detects the magnitude | size of a display area. The block diagram which shows the digital broadcast display apparatus of this invention.

Explanation of symbols

  R ... display area, 1 ... digital broadcast display system, 10 ... tuner module (digital broadcast receiver), 20 ... personal computer (digital broadcast display device), 22 ... signal selector, 27 ... signal processor, 28 ... display (display) Part), 28a ... screen, 29 ... speaker, 30 ... CPU (control part), 35 ... display control part, 36 ... display area detection part.

Claims (6)

A digital broadcast receiver that receives broadcast radio waves and outputs a digital broadcast signal included in the broadcast radio waves, and a broadcast signal that is connected to the digital broadcast receiver and output from the digital broadcast receiver A digital broadcast display system including a digital broadcast display device that performs predetermined signal processing and displays a video based on the broadcast signal subjected to the signal processing,
The digital broadcast display device has a signal processing unit that performs the signal processing on a broadcast signal output from the digital broadcast receiving device, and a video based on the broadcast signal that has been subjected to the signal processing by the signal processing unit. A first display unit having a first bandwidth as a broadcast signal that is subjected to the signal processing by the signal processing unit, a display region detection unit that detects a size of the display region, and a display region detection unit that detects a size of the display region A signal selection unit that selects one of the broadcast signal and a second broadcast signal having a second bandwidth narrower than the first bandwidth, and the size of the display region detected by the display region detection unit And a control unit that causes the signal selection unit to select one of the first and second broadcast signals.   The control unit determines whether the size of the display area detected by the display area detection unit is larger than the size of the video based on the second broadcast signal, and the size of the display area is If it is determined that the size of the video based on the second broadcast signal is larger, the signal selection unit selects the first broadcast signal and the size of the display area is set to the second broadcast signal. When it is determined that the size of the video based on the second broadcast signal is smaller than the size of the video based on or equal to the size of the video based on the second broadcast signal, the signal selection unit selects the second broadcast signal. The digital broadcast display system according to claim 1.   The display area detection unit detects whether or not the size of the display area has been changed, and the control unit detects the display area detection unit when detecting that the size of the display area has been changed. 3. The method according to claim 1, further comprising: causing the signal selection unit to select one of the first and second broadcast signals based on the size of the display area detected by the step 1. Digital broadcast display system.   A digital broadcast receiver that receives broadcast radio waves and outputs a digital broadcast signal included in the broadcast radio waves, and a signal processor that performs predetermined signal processing on the broadcast signals output from the digital broadcast receiver A display unit that displays a video based on the broadcast signal subjected to the signal processing by the signal processing unit in a predetermined display region, a display region detection unit that detects the size of the display region, and the signal processing unit As the broadcast signal to be subjected to the signal processing, the first broadcast signal having a first bandwidth and the second broadcast signal having a second bandwidth narrower than the first bandwidth are selected. A signal selection unit to be selected and a control unit that causes the signal selection unit to select one of the first and second broadcast signals based on the size of the display region detected by the display region detection unit Digital broadcast display apparatus comprising: a.   The control unit determines whether the size of the display area detected by the display area detection unit is larger than the size of the video based on the second broadcast signal, and the size of the display area is If it is determined that the size of the video based on the second broadcast signal is larger, the signal selection unit selects the first broadcast signal and the size of the display area is set to the second broadcast signal. When it is determined that the size of the video based on the second broadcast signal is smaller than the size of the video based on or equal to the size of the video based on the second broadcast signal, the signal selection unit selects the second broadcast signal. The digital broadcast display device according to claim 4.   The display area detection unit detects whether or not the size of the display area has been changed, and the control unit detects the display area detection unit when detecting that the size of the display area has been changed. 6. The method according to claim 4, wherein the signal selection unit selects one of the first broadcast signal and the second broadcast signal based on the size of the display area detected by the control unit. Digital broadcast display device.

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